Brake or clutch



v I 1,623,?03 c.- D, SCHMIDT j BRAKE OR CL iUTGI' I I Original Filed May16, 1922 26 IN TOR Patented A 5, 1927.

UNITED STATES 1,623.706 PATENT OFFICE.

CHARLES D. SCHMIDT, or JAMAICA, NEW-YORK.

BRAKE OR CLUTCH.

Original application filed May 16, 1922, Serial No. 561,350. Divided andthis application filed April 10,

, 1924. Serial No. 705,479.

This invention relates to' brakes or clutches of automotive vehicles andthe like and particularly to the cooling of the brake or clutch toprotect it from overheating and burning. The usual brake or clutch isprovided with a replaceable lining of woven material such as asbestos orcotton or a mixture with which is intermingled metal strands, the wholebe ing impregnated with a rubberized compound; or sometimes a fibrematerial is used. These flat bands or brake lining are fastened to thebrake bands or the brake drum shoes by means of rivets or the like andthe heat generated during the braking action is more or less confined tothe body of the brake lining and directly transmitted to the shoe orband. 1 i I The main object of this invention is to provide a brake orclutch inwhich the lining is air cooled.

A further object/of the invention is to provide a lining whichwillcontact only at intervals with-its supporting band so thatthe liningwill be permitted to adapt itself more readily to the formation of thedrum so as to give a more homogeneously braking efiec i In theaccompanying drawings illustrating the invention Fig. 1 is adiagrammatic sectional view of a brake having an outer band providedwith an air cooled lining.

Fig. 2 is a plan View of the air cooled surface of the lining shown inFig. 1, and Fig. 3 is a plan view of the surface of the lining shown inFigs. 1 and 2.

In the specific embodiment of the invention illustrated in Fig. 1a brakedrum 12 rotating on the shaft 13 is provided with an outer flexible band24 carrying a brake lining 25 which is drawn against the periphery ofthe drum by the operating mechanism 16 as shown. s The brake band 24 hasinterposed between it and the lining 25 .a corrugated strip of metal 26so that all the channels or spaces 27 will serve for air circulation forcooling the brake band and the lining. The outer surface-of the lininghas its area in contactwith the air increased "so that the circulationof the air will provide an additional cooling effect tending to maintaina lower temperature of the lining and avoid'overheating and burning. Theform of the air spaces may be any design that will effect less contactof the surface of the lining with the part to which it is fixed, whilethe other or braking side preferably has a flat surface and full bearingarea. All of these designs provide air spaces between the brake liningand the part to which it .is fixed so as to introduce an air coolingeffect.

'lhe'formation of the lining-so as to contact only at intervals with thesupporting band also permits the lining toadapt itself more readily tothe formation of the drum so as to give a more hon'iogeneously.distributed braking effect. The intervals of contact are relativelyclosely spaced, the length of each interval being less than the width ofthe lining. .At these intervals the supporting pressure on the backsurface of the lining is localized effecting a concentration of thesupporting pressure at said intervals of contact. Wherever anyirregularities occur so as to concentrate the pressure at a given areaof the lining, the lining will be permitted to yield readily under thislocalized concentration of pressure so as to substantially equalize thepressures throughout the face of the lining and the face of the drum andgiving a full efficient braking action without chattering. While theinvention has been described in connection with a specific form, it isnot confined theretojbut is intended to cover such variationsas fallwithin the scope of the appended claims, it being obvious that thelinlng of this invention may also be used in an internal expanding brakeor with a clutch.

This applicationis a division of my copending application Serial No.561,350, filed May 16, 1922.

I claim 1; In a brake or clutch the combination withca lining, of asupporting means there for concentrating the supporting pressure atintervals shorter than the width of the lining to permit the lining toadapt itself means therefor concentrating the support ing pressure atintervals while preserving the arcuate form of the braking surface ofthe lining so that the lining will adapt itself more readily to thecircular formation of the drum.'

4. In a brake or clutch having braking surfaces of generally circularform the combination with a lining, of a supporting means thereforconcentrating the supporting pressure at intervals while preserving thearcuate form of the braking surface of the lining so that the liningwill adapt itself more readily to the circular formation of the drum, asaid supporting means comprisiing a supporting member and a corrugatedstrip of metal between the supporting member and the lining and incontact with said lining.

5. Ina with a lining, of a supporting means thereforv comprising a metalband having bent portions contacting with the lining at intervals toconcentrate the supporting pressure at separated .areas and permit thelining to adapt itself more readily to the formation of the drum.

"6. In a brake or clutch the combination with a lining, of ajsupportingmeans therebrake or clutch the combination for comprising a band and anintermediate strip supported by said band and in turn supporting thelining, said strip being bent to contact with the band at intervals soas to form a resilient intermediate member permitting the lining toadapt itself more readily to the formation of the drum.

7. In a brake or clutch the combination with a lining, of a supportingmeans therefor comprising a'band and an intermediate strip supported bysaid band and in turn supporting the lining, said strip being bent tocontact with said band and lining at intervals so as to concentrate thesupporting ressure and permit the lining to adapt itself more readily tothe formation of the drum. v

8. In a brake or clutch the combination with a lining, of a supportingmeans therefor comprising a band and an intermediate strip supported bysaid band and in turn supporting the lining, said strip being bent ,tocontact with said lining at intervals so as to concentrate thesupporting pressure at separated areas and permit the lining to adaptitself more readily to the formation of the drum.

CHARLES D. SCHMIDT.

